I have a red vertical line on the right side of my screen and it will not go away tried restarting my computer and that didn't help at all, please help me with this problem it is kind of annoying

If it's a thin 1 pixel wide vertical line it's highly likely it could be caused by a defective LCD.

One quick basic way to check is to note the position of the line. Then go to System Preferences, Displays, and lower the resolution. If ther line moves it's on the video and the logic board or video card if fitted is likely to be defective. If the line stays in the same position it's likely to be an LCD fault. Either way to have it repaired you'll need to visit an Apple store or AASP.

The worst offender for this problem is the Late 2006 17" iMac. FOC replacement of the LCD used to be covered by a quality program, but it's now ended.

Steve

There are a number of things that could be possibly causing said issue and no one on this board would be able to diagnosis it correctly without having access to your machine. Making the only correct answer that you need to go see a certified tech to test the machine. Either at an Apple Store or a ASP 3rd party shop

my macbook pro 13 A502 has the same issue after upgraded to new OS. Please assist on this ?